At all the levels of the spinal cord, nerve cells in the gray substance are multipolar, varying much in their morphology. Many of them are Golgi type I and Golgi type II nerve cells. The axons of Golgi type I are long and pass out of the gray matter into the ventral spinal roots or the fiber tracts of the white matter.
Full Definition of MERCILESS. : having or showing no mercy: pitiless. â merÂ·ciÂ·lessÂ·ly adverb. â merÂ·ciÂ·lessÂ·ness noun. See merciless defined for English-language learners.
Cappillaries. The smallests (microscopic) of blood vessels (one cell layer thick) that are the site of gas, nutirent, and waste exchange between cells and the blood. They also connect arterioles to venules.